in this case he decided that he would try to answer that question and he runs this environment will help program and collected sippy cups from and sentnd toys "r" us them to an independent lab in texas to be tested. he found out in fact roughly 1/3 of them did contain estrogen-like chemicals. >> in that pink sippy cup? >> his daughter's sippy cup was reaching estrogenic chemicals. his fears were founded. >> what can i do to her? >> this is the big question. we know a lot about bpa. it is one of the most of the chemicals on the planet. and we know these chemicals generally are associated with a range of negative health effects. but the specific effect of any slightlymical varies from chemical to chemical. we actually don't know what chemical is leaching out of that sippy cup. it is impossible to know. there is a high correlation with rest cancer -- with breast cancer. other specific diseases vary from chemical to chemical. michael green, the way he describes it as an implant science experiment that we are on our families all of the time. >> we're going to take a break and then come back t